Hello Neha, Welcome to HealthcareMagic Forum.
It is natural after you cross 30 for the amount of menstrual blood to reduce as it all happens under hormonal
There seems to be nothing serious, if you are planning for kids after marriage, i would suggest you should be doing it early as the quality of egg reduces and you may face problems conceiving.
If the bleeding gets severe or if you have bleeding in between periods, you should be seeing a Gynecologist.
Wish you Good Health and Good Luck.